If you have a valid license and enough accounts to configure it, enable the Mobile Sync in the COS that you want under Home > Configure > Class of Service > YOURCOS > Zimbra Mobile

Configuring your account in the Windows Mail app

Be sure you are using Microsoft 8, 8.1 or 10, as the EAS feature will not work in Windows 7 or earlier.

Click the Start Button and click the Mail Icon and search for the feature called Mail

The Mail app wizard appears. Click Get started:

Click Add account to add your Zimbra account:

Select the Exchange option:

If the Autodiscover feature is properly configured, enter your Email address and Password when prompted and click Next.

If the Autodiscover feature is not configured, you need to enter all the information manually.
You will receive the next error, click on Advanced Settings:

Email address - Your business email address

Server address - Usually the same URL as the WebClient, (mail.example.com)

Domain - The domain of your company, (example.com)

Username - Your username, usually is the first part of the email address, like user@example.com, the username will be user

Password - The password from your business email

In case a self-signed certificate is used, and you do not have the valid CA and SSL certificate installed on your computer, you will get a warning. The best option is have a valid Commercial SSL certificate.

The wizard will finish and will ask to follow the policies that the server has.

Your account is ready to use:

Test the synchronization between the Mail app and the WebClient

Once the Profile is configured, just click in the Mail app icon.
Once opened, confirm that you have all the items synchronized between the WebClient and the Mail app.

Note: You are not able to check Shared Items for other users, such as mail folders, calendars, etc. If you want to do this, you need to install and configure ZCO and use Microsoft Outlook 2010 or above

Contacts

Using Contacts, you will have all the Contacts synchronized between the Mail app and the WebClient. To open Contacts, click the Start Menu and click People:

You will be able to see the contacts that you have in your Zimbra Web Client:

You can click Settings to be sure that you are pulling the Contacts from the Zimbra Server with your account:

Calendar

Zimbra with an account in EAS can synchronize the Calendar too, you can see the Calendar icon in your Mail app:

Or just open the Calendar app in the Start Menu:

First time you open the Calendar app, you will need to go through the wizard:

Once you have verified that you have your Zimbra account, click Get Started:

Here is the example and appointment created on the Web Client and automatically synced in the Mail App.

Advantages of still using ZCO with Microsoft Outlook 2010 and above

Zimbra Connector for Outlook (ZCO) has more options than a configuration with Outlook and EAS. With ZCO you can: